Roasting-furnace.



W. L. LOVBLAND ROASTING PURNAGE.

APPLICATION FILED 31111.17, 190e.

n. N H m T A Patented Apr. 20, 1909.

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UNITED STATES PATENT OEEC.

WILLIAM L. LOVELAND, OF MILWAUKEE, WISCONSIN, ASSIGN OR TOALLIS-CHALMERS COM- PANY, or

MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

ROASTING-FURNACE To all whom 'it may concern:

Be it known that I, WiLLrAM L. Lovn` LAND, a citizen of the UnitedStates, residing at Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented certain new and useful Improvements inRoasting-Furnaces, of which the following is a specification.

This invention relates to temperature control of a shaft.

rIhis invention has utility when applied to ore roasting furnaces andcomprises a simple and effective means for maintaining a sufhciently lowtemperature in the arms that the arms are not weakened by the heat.

Yeferring to the drawing, the hollow rotatable shaft 1 has a singlecompartment or passage extending longitudinally thereof. The shaft l hasalso a plurality of lateral openings communicating with tapered hollowradiating arms 2. shaft 1 and extendinglongitudinally thereof in itscompartment is the pipe 3. In the event that water is used as thetemperature controlling medium, it may be introduced from pipe 4 intothe pipe 3, conveyed to near one end of the shaft 1, and 'from thencepass into the compartment of the shaft 1 and freely circulate into thearms and along the compartment to the outlet pipe 5, The hollow`rotatable shaft I having arms 2, serves to water jacket the inlet pipe3. ji second valve controlled outlet 6 for the compartment of the shaft1, is shown at the opposite end of the compartment from the outlet pipe5.

It is customary to support the stirring arms and shaft in the type ofapparatus disclosed by this specication upon a step bearing, and as theshaft and arms especially when full of water are of considerable weight,a great deal of heat is developed at the step caring.

As shown by the drawings, the shaft is Specification of Letters Patent.

Application led January 17, 1906.

Concentric with the' Patented April 20, 1909.

Serial No. 296,447.

cast in sections, a separate section being provided for the stepbearing, the lower part of this section being recessed at 7 to receivethe bearing pin. The upper part of this member is also recessed, as at8, the two recesses approaching each other closely but leaving asufficient thickness of metal at Q to support the weight of the shaftand arms, even when full of water.

The pipe 3 through which the cooling water is admitted to the interiorof the shaft is extended well down within the recess 8 of the lowermostsection of the shaft, and the water discharging downwardly through saidpipe will first abstract the heat in this lower section which hasresulted from the friction of the shaft upon the bearing.

The upper recess of the shaft section which forms the stop bearing isnarrowed in its lower portion so as to provide for a narrow channel atthe outlet pipe 3 and surrounding saine and this narrow channel is atthe lowest point of the chamber within the hollow shaft. The effect ofsuch construction is to entirely obviate any clogging at this point andall sediment tending to form will be speedily washed away and thechannel kept open for eflicient circulation.

That is claimed and it is desired to secure by Letters Patent is:

A hollow sectional shaft, arms on the shaft, one of said sectionsforming a step bearing and being recessed and said recess being narrowedin its lower portion, and means for supplying water to said shaft andfor discharging same within the narrow portion of said recess.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM L. LOVELAND. Vllitnesses G. E DE WEIN, GEO. E. KIRK.

